An item having two plane-parallel surfaces and used in the telescopic system of an optical instrument to modify the density or spectral intensity of light by absorption. Several filters having varied characteristics are usually mounted in such a manner that any selected filter may be moved in or out of the optical axis as light conditions warrant. Excludes window, optical instrument.
Classification: Military equipments not identified by kind
NSN 6130-01-484-8002
NSN 4140-01-145-2858
NSN 6240-00-080-2012
NSN 5999-01-394-4919
NSN 5905-01-167-7191
NSN 5925-01-162-8108
NSN 5996-01-194-4498
NSN 6135-01-069-2482
NSN 6240-01-633-9357
NSN 5935-00-027-8426
NSN 7035-00-803-3056
NSN 5905-00-721-4378